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Constant Fill Fluid Couplings: KR, CKR, CCKR

The TRANSFLUID coupling (K series) is a constant fill type, comprising of three main elements:
1 - driving impeller (pump) mounted on the input shaft.
2 - driven impeller (turbine) mounted on the output shaft.
3 - cover, flanged to the outer impeller, with an oil-tight seal.
The first two elements can work both as pump or turbine.

The TRANSFLUID coupling is a hydrodynamic transmission. The impellers perform like a centrifugal pump and a hydraulic turbine. With an input drive to the pump (e.g. electric motor or Diesel engine) kinetic energy is transferred to the oil in the coupling. The oil is forced, by centrifugal force, across the blades of the pump towards the outside of the coupling.
The turbine absorbs kinetic energy and generates a torque always equal to input torque, thus causing rotation of the output shaft. Since there are no mechanical connections, the wear is practically zero. The efficiency is influenced only by the speed difference (slip) between pump and turbine.
 

The slip is essential for the correct operation of the coupling there could not be torque transmission without slip! The formula for slip, from which the power loss can be deduced is as follows: 

slip % = ((input sleed-output speed)/input speed) x 100
In normal conditions (standard duty), slip can vary from 1,5% (large power applications) to 6% (small power applications).

TRANSFLUID couplings follow the laws of all centrifugal machines:
1 - transmitted torque is proportional to the square of input speed;
2 - transmitted power is proportional to the third power of input speed;
3 - transmitted power is proportional to the fifth power of circuit outside diameter.

Advantages given by fluid couplings

– very smooth start-ups
reduction of current absorptions during the starting phase: the motor starts with very low load
protection of the motor and the driven machine from jams and overloads
utilization of asynchronous squirrel cage motors instead of special motors with soft starter devices
higher duration and operating convenience of the whole drive train, thanks to the protection function achieved by the fluid coupling
higher energy saving, thanks to current peak reduction
limited starting torque down to 120% in the versions with a double delayed fill chamber
same torque at input and output: the motor can supply the maximum torque even when load is jammed
torsional vibration absorption for internal combustion engines, thanks to the presence of a fluid as a power transmission element
– possibility to achieve a high number of start-ups, also with an inversion of the rotation direction
– load balancing in case of a double motor drive: fluid couplings automatically adjust load speed to the motors speed
high efficiency
minimum maintenance
Viton rotating seals
– cast iron and steel material with anticorrosion treatment

Versions

IN LINE

KR-CKR-CCKR: basic coupling (KR), with a simple (CKR) or double (CCKR) delayed fill chamber.
KRG-CKRG-CCKRG: basic coupling with elastic coupling
KRM-CKRM-CCKRM: (clamp type), or superelastic.
KRB-CKRB-CCKRB: like ..KRG, but with brake drum or …KRBP brake disc.
KRD-CKRD-CCKRD: basic coupling ..KR with output shaft. It allows the utilization of other flex couplings; it is possible to place it (with a convenient housing) between the motor and a hollow shaft gearbox. EK : fluid coupling fitted with a bell housing, to be placed between a flanged electric motor and a hollow shaft gearbox.

KCM-CKCM-CCKCM: basic coupling for half gear couplings.
KCG-CKCG-CCKCG: basic ..KCM with half gear couplings. On request, layout with brake drum or brake disc.
KDM-CKDM-CCKDM: fluid coupling with disc couplings. …KDMB : like ..KDM, but with brake drum or …KDMBP brake disc.

 

PULLEY

KSD–CKSD–CCKSD : basic coupling foreseen for a flanged pulley, with simple (CK..) or double (CCK..) delayed fill chamber.
KSI-CKSI-CCKSI : fluid coupling with an incorporated pulley, which is fitted from inside.
KSDF-CKSDF-CCKS..: basic ..KSD coupling with flanged pulley, externally mounted and therefore to be easily disassembled.

 

K Series Catalogue

 

Features

From

To

Size

6

D46

Power

1 kW

3500 kW

Max speed

3600 rpm

 

 

 

Constant Fluid Coupling Version For Combustion Engines

SKF VERSION 

The SKF serie Fluid Couplings are used on all types of industrial equipment driven by internal combustion engines up to 180 kW requiring a tight flywheel mounting. By transmitting power through a fluid, they improve overall performance and protect both driving and driven machine.

When you drive through Transfluid Coupling you profit by these Basic Benefits.

1 - Frees engine during heavy starts
During heavy starts and sudden running load increases, engine lugging is prevented. The Fluid Coupling simply "slip" while it smoothly picks up the load.
2 - Provides smoothly drive
Mechanical connection is eliminated; power and torque are transmitted entirely through mass and velocity of fluid. The result is a smooth, sustained flow of power minus the shocks and strains which, with mechanical drives, cut equipment life.
3 - Prevents transmission of shock loads
Fluid Couplings protects both driving and driven equipment by smoothing out shock loads and preventing them from striking solid resistance.
4 - Assures damping effects
Torsional vibrations from engine are drastically dampened by Fluid Coupling making longer life of entire transmission life.
5 - Transmits full input torque
The patented Transfluid Circuit design delivers output torque always equal to input torque. The engine can turn at its max torque-rpm, even when driven is at stall.
6 - Radial load capability.
The SKF serie includes the SKFE line which allows the installation of a pulley on output shaft.

 

SKF Version Catalogue

KX SPECIAL FLUID COUPLINGS

 

The KX is a fluid coupling with a special patented circuit designed to start up large inertia machines driven by eletric motors.The circuit includes two internal tanks connected by a scoop. The scoop works like a differential pump transferring the fluid from one chamber to the other and finally into the coupling working circuit through external adjustable valves. This double passage allows a long starting time with very low starting torque and current absorbtion by the electric motor, virtually isolating the effect of the inertia of driven machine.

The coupling can work using both oil and treated water as standard.

 

OPERATING CONDITIONS

The fluid quantity in the working circuit is less than in traditional constant fill fluid couplings, as the fluid level is much lower than the rotating axie. The reduced fluid quantity in the working circuit allows low starting torque. During input rotation the scoop transfers the fluid from tank A to tank B and then, through an adjustable valve for start up time regulation, to the working circuit.

 

MAIN FEATURES

Starting stall torque below 50% of the electric motor nominal torque.

Starting torque limitation also below nominal torque.

KX allows the fluid coupling removal without moving the electric motor or the driven machine avoiding the realignment.

KX has a fusible plug that in case of intevention, releases the fluid from the working circuit to a tank preventing leakages into the ambient.

A steel body design suitable for underground mines is available.

The fluid filling operation is quite easy and apart from some particular cases, it is not required to change the fluid during the test starting: the starting time can be optimized by changing on the externally adjustable valves.

KX fluid coupling is very suitable for driving machines having large powers and inertia: typical applications are mills and belt conveyors.

 

KX Version Catalogue

K series catalogue

QRCode

The TRANSFLUID coupling (K series) is a constant fill type, comprising of three main elements:
1 - driving impeller (pump) mounted on the input shaft.
2 - driven impeller (turbine) mounted on the output shaft.
3 - cover, flanged to the outer impeller, with an oil-tight seal.
The first two elements can work both as pump or turbine.

The TRANSFLUID coupling is a hydrodynamic transmission. The impellers perform like a centrifugal pump and a hydraulic turbine. With an input drive to the pump (e.g. electric motor or Diesel engine) kinetic energy is transferred to the oil in the coupling. The oil is forced, by centrifugal force, across the blades of the pump towards the outside of the coupling.
The turbine absorbs kinetic energy and generates a torque always equal to input torque, thus causing rotation of the output shaft. Since there are no mechanical connections, the wear is practically zero. The efficiency is influenced only by the speed difference (slip) between pump and turbine.
 

The slip is essential for the correct operation of the coupling there could not be torque transmission without slip! The formula for slip, from which the power loss can be deduced is as follows: 

slip % = ((input sleed-output speed)/input speed) x 100
In normal conditions (standard duty), slip can vary from 1,5% (large power applications) to 6% (small power applications).

TRANSFLUID couplings follow the laws of all centrifugal machines:
1 - transmitted torque is proportional to the square of input speed;
2 - transmitted power is proportional to the third power of input speed;
3 - transmitted power is proportional to the fifth power of circuit outside diameter.

Advantages given by fluid couplings

– very smooth start-ups
reduction of current absorptions during the starting phase: the motor starts with very low load
protection of the motor and the driven machine from jams and overloads
utilization of asynchronous squirrel cage motors instead of special motors with soft starter devices
higher duration and operating convenience of the whole drive train, thanks to the protection function achieved by the fluid coupling
higher energy saving, thanks to current peak reduction
limited starting torque down to 120% in the versions with a double delayed fill chamber
same torque at input and output: the motor can supply the maximum torque even when load is jammed
torsional vibration absorption for internal combustion engines, thanks to the presence of a fluid as a power transmission element
– possibility to achieve a high number of start-ups, also with an inversion of the rotation direction
– load balancing in case of a double motor drive: fluid couplings automatically adjust load speed to the motors speed
high efficiency
minimum maintenance
Viton rotating seals
– cast iron and steel material with anticorrosion treatment

Versions

IN LINE

KR-CKR-CCKR: basic coupling (KR), with a simple (CKR) or double (CCKR) delayed fill chamber.
KRG-CKRG-CCKRG: basic coupling with elastic coupling
KRM-CKRM-CCKRM: (clamp type), or superelastic.
KRB-CKRB-CCKRB: like ..KRG, but with brake drum or …KRBP brake disc.
KRD-CKRD-CCKRD: basic coupling ..KR with output shaft. It allows the utilization of other flex couplings; it is possible to place it (with a convenient housing) between the motor and a hollow shaft gearbox. EK : fluid coupling fitted with a bell housing, to be placed between a flanged electric motor and a hollow shaft gearbox.

KCM-CKCM-CCKCM: basic coupling for half gear couplings.
KCG-CKCG-CCKCG: basic ..KCM with half gear couplings. On request, layout with brake drum or brake disc.
KDM-CKDM-CCKDM: fluid coupling with disc couplings. …KDMB : like ..KDM, but with brake drum or …KDMBP brake disc.

 

PULLEY

KSD–CKSD–CCKSD : basic coupling foreseen for a flanged pulley, with simple (CK..) or double (CCK..) delayed fill chamber.
KSI-CKSI-CCKSI : fluid coupling with an incorporated pulley, which is fitted from inside.
KSDF-CKSDF-CCKS..: basic ..KSD coupling with flanged pulley, externally mounted and therefore to be easily disassembled.

 

K Series Catalogue

 

Features

From

To

Size

6

D46

Power

1 kW

3500 kW

Max speed

3600 rpm

 

 

 

Constant Fluid Coupling Version For Combustion Engines

SKF VERSION 

The SKF serie Fluid Couplings are used on all types of industrial equipment driven by internal combustion engines up to 180 kW requiring a tight flywheel mounting. By transmitting power through a fluid, they improve overall performance and protect both driving and driven machine.

When you drive through Transfluid Coupling you profit by these Basic Benefits.

1 - Frees engine during heavy starts
During heavy starts and sudden running load increases, engine lugging is prevented. The Fluid Coupling simply "slip" while it smoothly picks up the load.
2 - Provides smoothly drive
Mechanical connection is eliminated; power and torque are transmitted entirely through mass and velocity of fluid. The result is a smooth, sustained flow of power minus the shocks and strains which, with mechanical drives, cut equipment life.
3 - Prevents transmission of shock loads
Fluid Couplings protects both driving and driven equipment by smoothing out shock loads and preventing them from striking solid resistance.
4 - Assures damping effects
Torsional vibrations from engine are drastically dampened by Fluid Coupling making longer life of entire transmission life.
5 - Transmits full input torque
The patented Transfluid Circuit design delivers output torque always equal to input torque. The engine can turn at its max torque-rpm, even when driven is at stall.
6 - Radial load capability.
The SKF serie includes the SKFE line which allows the installation of a pulley on output shaft.

 

SKF Version Catalogue

KX SPECIAL FLUID COUPLINGS

 

The KX is a fluid coupling with a special patented circuit designed to start up large inertia machines driven by eletric motors.The circuit includes two internal tanks connected by a scoop. The scoop works like a differential pump transferring the fluid from one chamber to the other and finally into the coupling working circuit through external adjustable valves. This double passage allows a long starting time with very low starting torque and current absorbtion by the electric motor, virtually isolating the effect of the inertia of driven machine.

The coupling can work using both oil and treated water as standard.

 

OPERATING CONDITIONS

The fluid quantity in the working circuit is less than in traditional constant fill fluid couplings, as the fluid level is much lower than the rotating axie. The reduced fluid quantity in the working circuit allows low starting torque. During input rotation the scoop transfers the fluid from tank A to tank B and then, through an adjustable valve for start up time regulation, to the working circuit.

 

MAIN FEATURES

Starting stall torque below 50% of the electric motor nominal torque.

Starting torque limitation also below nominal torque.

KX allows the fluid coupling removal without moving the electric motor or the driven machine avoiding the realignment.

KX has a fusible plug that in case of intevention, releases the fluid from the working circuit to a tank preventing leakages into the ambient.

A steel body design suitable for underground mines is available.

The fluid filling operation is quite easy and apart from some particular cases, it is not required to change the fluid during the test starting: the starting time can be optimized by changing on the externally adjustable valves.

KX fluid coupling is very suitable for driving machines having large powers and inertia: typical applications are mills and belt conveyors.

 

KX Version Catalogue

K series catalogue

QRCode

Wherever needed, Esco Power, member of the Esco Group with 70 years of experience provides service & distribution of Power Transmissions for your Diesel- and Hydraulic engines in Marine and Industrial Applications. Our team specialized in selection, sales and after sales as well as our products itself are made it possible to offer you the right solution for every marine or industrial application. TWIN DISC Marine Gearboxes & Industrial Power Transmissions Power Take Off`s  Pump Drives, BRADEN-CARCO-GEARMATIC Winches Carco Hoists & Planetary Gearboxes, Nam Jet High-torque & Low speed Water Jets, Transfluid Fluid Couplings, Clutches, Power Take Off`s, Brakes, RBD & Multi Pump Drives TWIN DISC TECHNODRIVE Pump Drives, Power Take Off`s, Gearboxes and Couplings,  CENTA Elastic couplings, MEKANORD Marine Transmissions, COMER Planetary Drives, Axles, OMSI Split-Shafts and Axles, Esco Couplings Rigid & Flexible Couplings, FUNK Transmissions Pump Drives Axles. Esco Power is experienced with designing very demanding drive lines for varies applications like: heavy duty crushers, emergency drive lines, ventilation systems, mixers, parallel hybrid drives etc. Not only we design and sell we do also provide service and have big inventory for spare parts for all these products.